5 (х+3)-2 (5+х)=15 (х+4)
5х+15-10-2х=15х+60
3х+5-15х-60=0
-12х-55=0
-12х=55
х=55/-12
х=-4 7/12
5х +15 -10 -2х = 15х + 60, 3х +5 = 15х +60, 3х - 15х = 60-5, -12х = 55,